Preheat the oven to 350F.Sift flour, vanilla sugar, and baking powder together in a bowl. Whisk eggs and sugar in another large mixing bowl until it gets creamy. Gradually add vegetable oil, lemon zest, and peaches whisking consistently.
Add sifted flour, vanilla sugar, and baking powder to the bowl and mix thoroughly. Add blueberries the bowl and stir. Pour 2 tbsp of mixture into muffin cups and bake approximately 30 minutes. Check the cake by inserting a toothpick into the center. The toothpick will come out clean when the cake is done.